Carburetor



Feb. 24, 1925.

C. N. B. DUPLAN TIS CARBURETOR Original Filed May 24 INVENTOR Cuer/s m5, az/ um man/ms WITNESSES Patented Feb. 24, 1925.

UNITED STATES PATENT OFFICE.

CURTIS N. B. DUPLANTIS, h NEW ORLEANS, LOUISIANA, ASSIGNOR, BY MESNE AS- SIGNMENTS, OF ONE-HALF TO B. C. LAWLOR AND ROY OHIN'N', JOINTLY, BOTH OI NEW ORLEANS, LOUISIANA.

CARBURETOR.

Application filed May 24, 1922, Serial 1V0. 563,226. Renewed January 9, 1924.

which the following is a full, clear, and

exact description.

My invention relates to a carburetor, and

aims to provide certain new and useful improvements in connection with a device of this character, capable of use in connection with lighter fuels and is particularly adapted to be used in association with an internal 5 combustion engine.

It is an object of this invention to provide a device of the character stated which shall be extremely economical with respect to the use of fuel, aside from the fact that parts of the device will be reduced to a minimum so as to avoid undue complication, and consequential difliculities experienced in this connection.

A further object of this invention is the provision of a carburetor which may be either fed by gravity or be placed at a point above the tank or reservoir, it being noted that by means of my improved construction a vacuum tank may be dispensed with.

Further objects of this invention will become apparent in the annexed specification taken in connection with the drawings which latter illustrate one practical embodiment of the same, and in which:

Figure 1 is a partly sectional plan view of a carburetor embodying my improved construction.

Iiigure 2 is a sectional side view thereof, an

. Figure 3 is a transverse sectional end view of the device.

The essence of my inventionconsists in the provision of a carburetor which, shall dispense with the customary Venturi mixing chamber, etc. and in which the suction created by the engine shall be suflicient to produce an explosive fuel mixture, it being noted in this connection that the parts shall be so constructed, and arranged as to permit of a vacuum tank being dispensed with,

even although the carburetor is not a gravity fed device.

. In the embodiment illustrated it will be seen that the reference numeral 5 indicates 1.0 with which a spring pressed valve 11 00-,

operates, it being further seen that a perforated plug 12 is positionedin the feed line 9 at a point beyond the valve 11, and

preferably provides a valve seat with which a valve 13, forming part of the stem 14 cogpsrates, for a purpose hereinafter speci- With a view of providing an air supply for the carburetor it will be noted that the body of the carburetor is extended to form an air inlet housing 15, and this housing encloses a spring pressed valve 16 cooperating with a suitable valve seat forming part of the air intake connections 17 secured to said housing.

The bottom of the skirt 8 terminates adjacent the plug 12, providing a restricted communication between the air intake housing 12 and said skirt, and'adjacent the valve seat in the plug 12. This restricted passage causes a greater reduction of air pressure about the fuel inlet in said plug than elsewhere in the carburetor so that fuel will be more readily raised from the main supply tank.

A throttle valve 18 is movably positioned within the discharge end 19 of the carburetor, which latter end portion is preferably in communication with the chamber 6 at a point diametrically opposite the extension forming the air intake housing. Further a by-pass 20 has one of its ends connected with the housin 17, its opposite end being connected with 518 outlet end 19 of the carburetor, and thus a direct communication is provided between the housing 15, and the end 19, it being noted that the flow of air through this by-pass is controlled by means of a valve 21 operatively connected by links 22 to the operating elements of the throttle valve 18.

Thus it will be understood that upon the suction being exerted within the chamber 6 that the valve 11 will become unseated thus allowing a certain amount of fuel to flow through the plug 12, and incident to the fact that the valve 16 will also become unseated, it will be understood that this fuel will be picked up by air which passes under the skirt 8 and over the upper face of the plug 12. The fuel mixture will now flow from the chamber 6 past the throttle valve 18 and so into the discharge end 19, but it will further be seen that a certain quantity of air will flow through the by pass 20 and incident to the fact that the valves 21 and 18 are coupled together, the latter valve will be opened to permit of aflow of air through the by-pass in direct ratio to the How of mixture moving from the discharge end 19 of the carburetor. The upper end of chamber 6 has a threaded opening into which is screwed athreaded plug 24. A nut 25 on said plug locks the plug in adjusted position in the threaded opening. A polygonal portion 26 on the plug 24 is adapted to be engaged by a suitable toolfor turning the same.

A threaded portion 27 of the valve stem 14 engages a central threaded passage in the plug 24 whereby the valve 13 may be adjusted towards or away from the valve seat in the plug 12. i

A pair of rods 28 and 29 integrally formed at diametrically opposite points on the bottom of the plug 24 and depending from the said plug are connected at diametrically opposite points to the upper face and adjacent the periphery of the plug 12. The plug 24, plug 12 and rods 28 and29 form an integral construction so that when the plug 24 is turned by means of the polygonal portion 26 the plug 12 will be carried downwardly against the tension of the spring 30 which is in engagement with the valve 11. When the plug 12 is moved against the tension of the spring 3 the adjustment of the valve 13 will not e disturbed relative to its seat in the plug 12 since the stem 14 is carried by the unitary structure of the plugs 12, 24 and the rods 28 and 29, and the valve stem 14 is adjustable independently of the adjustment of the plug 24. The valve 11 is provided with diagonally disposed grooves 31 in its outer wall which open into a chamber above the valve 11 and into the space below said valve whereby. the space surrounding the valve seat 10 is in open communication with the space above the valve 11 and below the plug 12. The plug 12, the rods 28 and 29, the valve 14 may be removed bodily with the plug 24.

It will finally be understoodthat numerous modifications of structure might readily be resorted to without in the least departing from the scope of my claims; which are' 1. A carburetor including a body presenting a chamber, .a source of fuel supply connected to said body, an air intake housing in communication with said body, and provided with a valve controlled port leading to the atmosphere, a discharge conduit in communication with said body, a throttle valve positioned within the discharge conduit, a by-pass havingv one of its ends in communication with the air intake housing and its opposite end connected to the discharge conduit at a point posterior to the said throttle valve, a valve positioned within said by-pass, and means for synchronizing thehnovements of said valve for supplying varying quantities of unadul-- terated air from the intake housing directly to the combustible mixture passing through the discharge conduit and thereby decreasing the normal supply of fuel to the air and the quantity of air passing tin ough the chamber from the air intake housing.

2. A carburetor comprising a body hav ing a chamber therein, "a battle diagonally disposed across the chamber and dividing the same into upper and lower 'compartments, an air intake housing inopen communication with the lower compartment, the upper compartment forming a mixing chamber, said bafile being provided with a centrally disposed opening, a cylindrical skirt depending from said opening and terminating at a point adjacent the inner bottom wall of the body, a fuelconduit for discharging fuel into the air passing through the skirt, said conduit being connected with the lower compartment and provided with a valve seat, a valve adapted to engage the valve seat, the air intake housing being provided with a valve controlled air inlet port, an outlet passage in open communication with the upper compartment of the chamber of the body member, and a valve located in the outlet passage.

3. A carburetor comprising a body having a chamber and having threaded openings at diametrically opposite points, an internally threaded hollow plug screwed into one of the openings, a hollow plug located in the chamber and having a valve seat, a fuel pipe, a ollow member screwed into the other. opening, and connecting the fuel pipe to the body, said second plug being screwed into the hollow member, rods connecting the two plugs, a valve stem having a threaded, portion screwed into the threaded passage of the valve at its end engageable with the valve seat in the other plug.

first-mentioned plug and provided with a 4. A carburetor comprising a body having a chamber and having threaded openmgs at diametrically opposite points, an

internally threaded hollow plug screwed into one of the openings, a hollow plug located in the chamber and having a valve seat, a fuel pipe, a hollow member screwed and rods being removable from the body 7 member as a unitary structure.- 1

5. A carburetor comprising a body having a chamber and having threaded openings at diametrically opposite points, a batlle extending diagonally of the chamber in the body member dividing said chamber into upper and lower compartments and provided with a central opening, a cylindrical skirt depending from said opening and terminating adjacent one of the openings, an internally threaded hollow plug screwed into one of the openings, a hollow plug located in the lower compartment and having a valve seat, a fuel pipe, a hollow member screwed into the other opening, and connecting the fuel pipe to the body, said second plug being screwed into the hollow member, rods connecting the two plugs, a valve stem having a threaded portion screwed into the threaded passage of the first mentioned plug and provided with a valve at its end engageable with the valve seat in the other plug, said rods and plugs forming a unitary structure and extending centrally of the the cylindrical skirt.

6. A carburetor comprising a body .having a chamber and having threaded openings at diametrically opposite points, a hollow plug screwed into one of the openings, a hollow plug located in the chamber and having a valve seat, a fuel pipe, a hollow member screwed into the other opening, and connecting the fuel pipe to the body, said second plug being screwed into the hollow member, rods connecting the two plugs, a valve stem mounted for adjustment in the first mentioned hollow plug and provided with a valve at its end engageable with the valve seat in the other plug, means on the first mentioned plug, adapted to be gripped by a suitable, tool for turning said plug, the hollow member being provided with a valve seat below said plug, a valve in the hollow member and engageable with the seat for normally closing the fuel pipe from the chamber, a spring engaging the last mentioned valve and the bottom of the second plug, the two plugs, valve stem and rods being removable as a unitary structure and rotatable for adjusting the tension of the spring on the second valve without disturbing the adjustment of the valve stem.

CURTIS N. B. DUPLANTIS. 

